R.I. Gen. Laws § 31-15-9: One way highways.

(a) The state traffic commission may designate any highway or any separate roadway under its jurisdiction for one-way traffic and shall erect appropriate signs giving notice of one-way traffic.

(b) Upon a roadway designated and signposted for one-way traffic a vehicle shall be driven only in the direction designated. Violations of this section are subject to fines enumerated in § 31-41.1-4.

(c) If a motorist violates this section on an interstate highway or on an entrance or exit ramp connected to an interstate highway, the motorist may be subject to a fine of up to five hundred dollars ($500) or license suspension of up to six (6) months, or both.